1221197493120 has 256 divisors, whose sum is σ = 4383420917760. Its totient is φ = 286497792000.

The previous prime is 1221197493091. The next prime is 1221197493133. The reversal of 1221197493120 is 213947911221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 277891 + ... + 1587330.

It is an arithmetic number, because the mean of its divisors is an integer number (17122737960).

Almost surely, 2^{1221197493120} is an apocalyptic number.

1221197493120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221197493120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2191710458880).

1221197493120 is an abundant number, since it is smaller than the sum of its proper divisors (3162223424640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221197493120 is a wasteful number, since it uses less digits than its factorization.

1221197493120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1865285 (or 1865273 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The spelling of 1221197493120 in words is "one trillion, two hundred twenty-one billion, one hundred ninety-seven million, four hundred ninety-three thousand, one hundred twenty".